docs: def parse_hash_comment(file_path):
      """
      Read file with given file_path line by line,
      return the first line that starts with "# SHA1:", like this:
  
          # SHA1:da39a3ee5e6b4b0d3255bfef95601890afd80709
      """
      with open(file_path) as fp:
          for line in fp:
              if line.startswith("# SHA1:"):
                  return line
      return None